TM9-2320-361-10 2-6. SPECIAL PURPOSE KITS CONTROLS AND INDICATORS (Contd) c. Arctic Winterization Kit (Contd). Key 1 2 3 d. Key 4 5 Item and Function Hardtop Closure replaces canvas cover on cab for arctic temperature operations. Quilted Engine Compartment Cover is attached to brush guard, hook, and side panels to maintain normal operating temperatures under arctic operating conditions. Aperature Flap is opened or closed to control amount of air passing through radiator. Deepwater Fording Kit, Item and Function Fording Valve Control Lever positioned to the left activates air pressure system and forces air into flywheel housing to prevent water seepage. Flywheel Housing Drainplug is removed from storage boss and installed in flywheel drainport to prevent water entering flywheel housing. 2-26